Great, this is very interesting. Thanks! By the way, is there really such a thing as a "Windows font" and a "Mac font" (for the same font)? Isn't OTF supposed to be fully interoperable? (maybe I should open a new question)
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julien_cJul 11 '12 at 14:55

OpenType is fully interoperable (but don't abbreviate to OTF - OT fonts may either be OTF, i.e. Postscript based, or TTF, i.e. TrueType based). Postscript fonts were Mac or Win specific. I think some Truetype fonts were too (Mac system fonts perhaps?) It's a lot easier than it used to be!
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e100Jul 11 '12 at 15:22